private void DrawShadow()
{
RaycastHit2D[] hits = null;
_source.GetHits(ref hits);
if (hits.Length == 0)
{
return;
}
int vertCount = hits.Length * 4;
int indexCount = hits.Length * 6;
Vector3[] verts = new Vector3[vertCount];
int[] indices = new int[indexCount];
var uv = new Vector2[verts.Length];
int vi = 0;
int ii = 0;
for (int i = 0; i < hits.Length; i++)
{
// find edges
var collider = hits[i].collider as CircleCollider2D;
_source.GetShadowPositions(ref verts, vi, collider);
// make two tris
indices[ii] = vi;
indices[ii + 1] = vi + 1;
indices[ii + 2] = vi + 2;
indices[ii + 3] = vi + 1;
indices[ii + 4] = vi + 2;
indices[ii + 5] = vi + 3;
vi += 4;
ii += 6;
}
_mesh.Clear();
_mesh.vertices = verts;
_mesh.triangles = indices;
_mesh.RecalculateNormals();
_mesh.RecalculateBounds();
var size = _source.range * 2;
for (int i = 0; i < verts.Length; i++)
{
var tv = (Vector2)verts[i] - _source.Position;
uv[i].x = tv.x / size;
uv[i].y = tv.y / size;
}
_mesh.uv = uv;
}